One-piece putting game device



FIG. 1 is a perspective view of a one-piece putting game device showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right side elevation view thereof, the opposite side being a mirror image; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing the golf balls in FIG. 3 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a one-piece putting game device, as shown and described. 